http://www.excelfornoobs.com http://www.excelfornoobs.com/exceltutorial7.php?title=Excel%20For%20Noobs%20Tutorial:%20Circular%20Reference%20and%20Enabling%20Iterations%20to%20Fix%20Circular%20Reference%20Formulas Excel 2013 Tutorial for Beginners on How to Fix circular reference problems in Excel. A circular reference error arises when a formula either